Fix up upload_part has no headers

Author: dt3310321

qcloud_cos/cos_auth.pyc

@@ -336,6 +336,7 @@ def upload_part(self, Bucket, Key, Body, PartNumber, UploadId, **kwargs):
         rt = self.send_request(
                 method='PUT',
                 url=url,
+                headers=headers,
                 auth=CosS3Auth(self._conf._access_id, self._conf._access_key),
                 data=Body)
         response = dict()